Buffett's top 10 stock holdings

7. Wal-Mart Stores

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Shares: 56.8 million
Market value: $4.5 billion
Year-ago rank: 7

Buffett's investing fundamentals No. 2: Focus on the future productivity of the asset you are considering. If you don’t feel comfortable making a rough estimate of the asset’s future earnings, just forget it and move on. No one has the ability to evaluate every investment possibility. But omniscience isn't necessary; you only need to understand the actions you undertake.